90000001 has 8 divisors (see below), whose sum is σ = 110769344. Its totient is φ = 71208720.

The previous prime is 89999999. The next prime is 90000049. The reversal of 90000001 is 10000009.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90000001 - 2¹ = 89999999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90000301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 494415 + ... + 494596.

It is an arithmetic number, because the mean of its divisors is an integer number (13846168).

Almost surely, 2^90000001 is an apocalyptic number.

90000001 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

90000001 is a deficient number, since it is larger than the sum of its proper divisors (20769343).

90000001 is a wasteful number, since it uses less digits than its factorization.

90000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989031.

The product of its (nonzero) digits is 9, while the sum is 10.

The square root of 90000001 is about 9486.8330332098. The cubic root of 90000001 is about 448.1404763155.

The spelling of 90000001 in words is "ninety million, one", and thus it is an aban number and an uban number.